For hosting common files it's ok. Also it is on Android too do, great to transfer files between your Windows and your phone. But if you want better security you have to subscribe a monthly offer.
Dropbox - Online Sync and File Sharing
Carbon Copy Cloner - Carbon Copy Cloner (CCC) features an interface designed to make the cloning and backup procedure...
Google Drive - Access and sync your files anywhere
Duplicati - Free backup software to store backups online with strong encryption. Works with FTP, SSH, WebDAV, OneDrive, Amazon S3, Google Drive and many others.
Mega - Secure File Storage and collaboration
SpiderOak - SpiderOak makes it possible for you to privately store, sync, share & access your data from everywhere.